JP6741611B2 - Motorized valve - Google Patents

Description

The present invention relates to an electric valve, and more particularly to an electric valve capable of detecting the position of a valve body.

It is known to use an angle sensor to detect the valve opening of a motor-operated valve.

As a related technique, Patent Document 1 discloses a valve opening detection device for a motor-operated valve. The valve opening degree detection device described in Patent Document 1 has a magnetic drum in which an N pole and an S pole fixed to a rotating shaft are magnetized in a circumferentially divided manner, and a circle outside the can that faces the NS pole. Magnetic sensor for detecting the rotation angle provided on the magnetic field, a magnet provided at the end of the rotary shaft, a magnetic sensor for detecting the vertical position, which is provided outside the can facing the magnet, a magnetic sensor for detecting the rotational angle, and a vertical position detecting Valve opening calculation means for calculating the valve opening from the detection value of the magnetic sensor for use in the vehicle.

In addition, Patent Document 2 discloses an electric valve using a stepping motor. The motor-operated valve described in Patent Document 2 includes a stator, a rotor that is rotationally driven by the stator, a detection rotor that detects the rotational position of the rotor, and a Hall IC that is arranged outside the detection rotor. In the motor-operated valve described in Patent Document 2, the rotational position of the rotor is detected based on the output signal detected by the Hall IC arranged outside the detection rotor.

JP 2001-12633 A JP, 2014-161152, A

In the motor-operated valves described in Patent Documents 1 and 2, the rotation angle of the rotating body is detected by a magnetic sensor arranged radially outside the rotating body such as the rotor. However, when detecting the rotation angle of the rotating body by the magnetic sensor arranged in the radial direction of the rotating body, the rotation angle of the rotating body can be accurately measured unless a large number of magnetic sensors are arranged in the radial direction of the rotating body. Difficult to detect. The cost increases when a large number of magnetic sensors are arranged. In addition, it is necessary to secure a space for arranging a large number of magnetic sensors, and a supporting mechanism for supporting a large number of magnetic sensors may be complicated. When the magnetic sensor detects the rotation angle by increasing or decreasing the Hall current, the rotation angle information is lost when the power is turned off, and the absolute rotation of the rotating body is lost when the power is turned on again. You may not know the angle.

Then, the objective of this invention is providing the electrically operated valve which can detect the position of a valve body more correctly by detecting the rotation angle of a rotating shaft more correctly.

In order to achieve the above object, an electrically operated valve according to the present invention includes a valve body, a driver that moves the valve body along a first axis, a rotary shaft that rotates the driver around the first axis, and A permanent magnet member arranged on the rotary shaft and rotating together with the rotary shaft, an angle sensor for detecting a rotation angle of a permanent magnet included in the permanent magnet member, and a case housing the permanent magnet member are provided. The angle sensor is arranged above the permanent magnet, the end wall of the case is arranged between the angle sensor and the permanent magnet member, and the angle between the permanent magnet and the angle is inside the case. A permanent magnet positioning member is arranged which maintains a constant distance to the sensor .

In an electrically operated valve according to some embodiments, a valve body, a driver for moving the valve body along a first axis, a rotary shaft for rotating the driver around the first axis, and a rotary shaft arranged on the rotary shaft. A permanent magnet member that rotates together with the rotary shaft; an angle sensor that detects a rotation angle of a permanent magnet included in the permanent magnet member; and a case that houses the permanent magnet member. The angle sensor is arranged above the permanent magnet, an end wall of the case is arranged between the angle sensor and the permanent magnet member, and a space inside the case is divided into an upper space and a lower space. And a partition member for partitioning the permanent magnet member into the upper space .

In the electrically operated valve according to some embodiments, the partition member may be made of a soft magnetic material .

In an electrically operated valve according to some embodiments, a valve body, a driver for moving the valve body along a first axis, a rotary shaft for rotating the driver around the first axis, and a rotary shaft arranged on the rotary shaft. A permanent magnet member that rotates together with the rotating shaft, and an angle sensor that detects a rotation angle of a permanent magnet included in the permanent magnet member. The angle sensor is disposed above the permanent magnet, the rotary shaft is movable relative to the permanent magnet member in a direction along the first axis, and the permanent magnet member is the permanent magnet. Includes a second engaging portion that engages with the first engaging portion of the rotating shaft so as to rotate with the rotating shaft .

In the motor-operated valve according to some embodiments, the angle sensor may be supported by a control board that controls a rotating operation of the rotating shaft .

In the electrically operated valve according to some embodiments, the driver and the rotating shaft may be separate bodies. The driver and the rotating shaft may be movable relative to each other along the first axis.

In the electrically operated valve according to some embodiments, the angle sensor may include a plurality of magnetic detection elements that detect a component of the magnetic flux in a direction along the first axis.

The electrically operated valve according to some embodiments further includes a stator member including a coil, a rotor member coupled to the rotating shaft so as to be capable of transmitting power, and an arithmetic device for determining whether or not the electrically operated valve has an abnormal operation. May be. The arithmetic unit may determine whether or not there is an operation abnormality of the motor-operated valve based on the rotation angle measured by the angle sensor and the number of input pulses to the coil.

According to the present invention, it is possible to provide an electrically operated valve capable of detecting the position of the valve body more accurately.

FIG. 1 is a schematic cross-sectional view showing the outline of the motor-operated valve according to the first embodiment. FIG. 2 is a schematic cross-sectional view of the motor-operated valve according to the second embodiment. FIG. 3 is a schematic enlarged cross-sectional view of a part of the motor-operated valve according to the second embodiment. FIG. 4 is a diagram in which a part of FIG. 3 is further enlarged. FIG. 5 is a schematic enlarged cross-sectional view of a part of the motor-operated valve according to the third embodiment. FIG. 6 is a sectional view taken along the line AA in FIG. FIG. 7: is the figure which expanded a part of FIG. 5 further. FIG. 8 is a sectional view taken along the line BB in FIG. FIG. 9 is a diagram schematically showing the positional relationship between the permanent magnets and the angle sensor. FIG. 10 is a diagram schematically showing the positional relationship between the permanent magnets and the angle sensor. FIG. 11 is a diagram schematically showing the positional relationship between the permanent magnets and the angle sensor. FIG. 12 is a diagram schematically showing the positional relationship between the permanent magnets and the angle sensor. FIG. 13 is a functional block diagram schematically showing the function of the arithmetic unit for determining the presence/absence of operation abnormality of the electric valve.

Hereinafter, a motor-operated valve according to the embodiment will be described with reference to the drawings. In the following description of the embodiments, parts and members having the same function are designated by the same reference numerals, and repeated description of the parts and members designated by the same reference numerals will be omitted.

(First embodiment)
The electrically operated valve A in the first embodiment will be described with reference to FIG. 1. FIG. 1 is a schematic cross-sectional view showing the outline of the motor-operated valve A according to the first embodiment. In addition, in FIG. 1, a part of the motor-operated valve A is omitted in order to avoid complication of the drawing.

The motor-operated valve A includes a valve body 10, a driver 30, a rotary shaft 50, a power source 60 for transmitting power to the rotary shaft 50, a permanent magnet member 70 including a permanent magnet 72, and a rotation angle of the permanent magnet 72. And an angle sensor 80 for detecting.

The valve body 10 closes the flow path by coming into contact with the valve seat 20, and opens the flow path by separating from the valve seat 20.

The driver 30 is a member that moves the valve body 10 along the first axis Z. In the example shown in FIG. 1, a male screw 31 is provided on the outer peripheral surface of the driver 30. The male screw 31 is screwed into a female screw 41 provided on a guide member 40 that guides the driver. When the driver 30 rotates with respect to the guide member 40, the driver 30 moves along the first axis Z. The driver 30 and the valve body 10 are mechanically connected. Therefore, when the driver 30 moves along the first axis Z, the valve body 10 also moves along the first axis Z. The driver 30 and the valve body 10 may be integrally formed or may be separately formed.

The rotating shaft 50 is a member that rotates the driver 30 around the first axis Z. The rotary shaft 50 receives power from the power source 60 and rotates about the first axis Z. The rotary shaft 50 and the driver 30 are mechanically connected. Therefore, when the rotary shaft 50 rotates about the first axis Z, the driver 30 also rotates about the first axis Z. The rotary shaft 50 and the driver 30 may be integrally formed or may be separately formed.

In the example shown in FIG. 1, the valve body 10, the driver 30, and the rotary shaft 50 are arranged on a straight line (on the first axis Z). Therefore, the motion conversion mechanism that converts the rotational motion of the rotary shaft 50 into the axial motion of the valve body 10 is simplified. Note that the embodiment is not limited to the valve body 10, the driver 30, and the rotating shaft 50 being arranged in a straight line.

The permanent magnet member 70 rotates around the first axis Z together with the rotating shaft 50. The permanent magnet member 70 includes a permanent magnet 72, and the permanent magnet 72 includes an N pole and an S pole in a cross section perpendicular to the first axis Z. The permanent magnet member 70 may be fixed to the rotating shaft 50. Alternatively, as shown in a third embodiment to be described later, the permanent magnet member 70 cannot rotate relative to the rotary shaft 50 and can move relative to the rotary shaft 50 in the first axis Z direction. It may be.

The angle sensor 80 detects the rotation angle of the permanent magnet 72 included in the permanent magnet member 70. The angle sensor 80 is arranged above the permanent magnet 72. Since the angle sensor 80 is a sensor that detects the rotation angle of the permanent magnet 72, it is arranged apart from the rotating body including the permanent magnet 72. The angle sensor 80 includes a magnetic detection element 82 that detects magnetic flux density and the like. When the permanent magnet 72 rotates around the first axis Z, the magnetic flux passing through the magnetic detection element 82 changes. In this way, the magnetic detection element 82 (angle sensor 80) detects the rotation angle of the permanent magnet 72 about the first axis Z.

When the permanent magnet 72 rotates about the first axis Z, the angle of the magnetic flux passing through the magnetic detection element 82 arranged above the permanent magnet changes continuously. Therefore, the magnetic detection element 82 (angle sensor 80) can continuously detect the rotation angle of the permanent magnet 72 about the first axis Z. In the example shown in FIG. 1, the change in the rotation angle of the permanent magnet 72 about the first axis Z is proportional to the change in the position of the valve body 10 in the direction along the first axis Z. Therefore, the angle sensor 80 can calculate the position of the valve body 10 in the direction along the first axis Z, that is, the opening degree of the valve by detecting the rotation angle of the permanent magnet 72 about the first axis Z. it can. The motor-operated valve A may include an arithmetic device that converts the angle data output by the angle sensor 80 into position data of the valve body 10 in the direction along the first axis Z, that is, valve opening data. The arithmetic device may be arranged on the control board 90.

In this specification, the end of the rotary shaft 50 on the valve body 10 side is called the second end, and the end of the rotary shaft 50 opposite to the valve body is called the first end. Further, in the present specification, “upward” is defined as a direction from the second end portion to the first end portion. Therefore, in reality, even when the second end is lower than the first end, in the present specification, the direction from the second end to the first end is “upper”. is there. In this specification, the direction opposite to the upper direction, that is, the direction from the first end portion to the second end portion is “downward”. Further, the angle sensor 80 is not limited to the arrangement in which the center of the rotation shaft 50 coincides with the rotation axis of the rotation shaft 50, and the mounting position may be changed according to the measurement sensitivity.

(Optional additional configuration example 1)
An optional additional configuration example that can be adopted in the first embodiment will be described. In the configuration example 1, the valve body 10, the rotary shaft 50, the permanent magnet 72, and the angle sensor 80 are arranged on a straight line. By arranging the valve body 10, the rotating shaft 50, the permanent magnet 72, and the angle sensor 80 in a straight line, the drive mechanism of the valve body and the rotation angle detecting mechanism of the permanent magnet (in other words, the valve body). It is possible to make the entire motor-operated valve A including the position detection mechanism (1) and (3) compact.

(Optional additional configuration example 2)
In the configuration example 2, the angle sensor 80 is supported by the control board 90 that controls the rotating operation of the rotating shaft 50. Therefore, it is not necessary to separately prepare a support member that supports the angle sensor 80. Therefore, the structure of the electric valve A is simplified, and the electric valve A can be downsized. The control board 90 sends a control signal to the power source 60 to control the operation of the power source.

(Optional additional configuration example 3)
In Configuration Example 3, the motor-operated valve A includes a case (for example, a metal can 100) that houses the permanent magnet 72. The end wall 102 of the case is arranged between the angle sensor 80 and the permanent magnet member 70. In other words, the angle sensor 80 and the permanent magnet member 70 are arranged to face each other with the end wall 102 of the case interposed therebetween. The case is not a rotating body that rotates around the first axis Z. Therefore, when the motor-operated valve A operates, the permanent magnet 72 rotates relative to the case in the stationary state. When the rotating body such as the permanent magnet 72 rotates in the case, the vibration of the rotating body may be transmitted to the case. In the example shown in FIG. 1, since the angle sensor 80 is spaced apart from the case, the vibration of the rotating body is suppressed from being transmitted to the angle sensor 80. Therefore, the angle detection accuracy of the permanent magnet by the angle sensor 80 is improved.

In the example shown in FIG. 1, the end wall 102 of the case covers the upper surface of the permanent magnet member 70. In the example illustrated in FIG. 1, the end wall 102 has a dome shape that is convex upward. A cylindrical side wall 104 extends downward from the end wall 102 of the case.

In addition, in the first embodiment, it is also possible to adopt the configuration examples 1 to 3 in combination. For example, in the first embodiment, configuration example 1 and configuration example 2, configuration example 2 and configuration example 3, or configuration examples 1 to 3 may be adopted. The configuration examples 1 to 3 may be adopted in the embodiments (second embodiment and third embodiment) described later.

(Second embodiment)
A motor-operated valve B according to the second embodiment will be described with reference to FIGS. 2 to 4. FIG. 2 is a schematic cross-sectional view of the motor-operated valve B according to the second embodiment. FIG. 3 is a schematic enlarged cross-sectional view of a part of the motor-operated valve B according to the second embodiment. Further, FIG. 4 is a diagram in which a part of FIG. 3 is further enlarged.

The electric valve B includes a valve body 10, a valve seat 20, a driver 30, a rotating shaft 50, a power source 60 for transmitting power to the rotating shaft 50, a permanent magnet member 70 including a permanent magnet 72, and a permanent magnet. An angle sensor 80 for detecting the rotation angle of 72.

The motor-operated valve B includes a first flow path 112 and a second flow path 114. When the valve body 10 and the valve seat 20 are separated, in other words, when the valve body 10 is in the upper position, the fluid flows into the valve chamber 113 through the first flow passage 112, The fluid in 113 is discharged through the second flow path 114. On the other hand, when the valve body 10 and the valve seat 20 are in contact with each other, in other words, when the valve body 10 is in the lower position, the first flow passage 112 and the second flow passage 114 are in a non-communication state with each other. ..

In the example shown in FIG. 2, the first flow path 112, the valve seat 20, and the second flow path 114 are provided in the lower base member 2.

In the example illustrated in FIG. 2, the electric valve B includes a power source 60 and a power transmission mechanism 120. The power source 60 includes a stator member 62 including a coil 620 and a rotor member 64. A pulse signal is input to the coil 620 from an electric wire 630 connected to a power source. When the pulse signal is input to the coil 620, the rotor member 64 rotates by the rotation angle corresponding to the number of pulses of the pulse signal. That is, in the example illustrated in FIG. 2, the stator member 62 and the rotor member 64 form a stepping motor.

The power transmission mechanism 120 is a member that connects the rotor member 64 and the rotary shaft 50 so that power can be transmitted. The power transmission mechanism 120 includes a plurality of gears. The power transmission mechanism 120 may include a planetary gear mechanism. Details of the planetary gear mechanism will be described later.

In the example illustrated in FIG. 2, the motor-operated valve B includes the housing member 4. A housing space SP (for example, a liquid-tight closed space) is formed in the housing member 4, and the stator member 62, the can 100, the control board 90, and the like described above are housed in the housing space SP.

In the example shown in FIG. 2, the control board 90 is supported by the housing member 4. More specifically, the housing member 4 includes a tubular member 4a forming a side wall and a cover member 4b, and the control board 90 is supported by the cover member 4b.

The control board 90 (more specifically, a circuit on the control board) controls the number of pulses supplied to the coil 620. When the predetermined number of pulses is supplied to the coil 620, the rotor member 64 rotates by the rotation angle corresponding to the number of pulses. The rotor member 64 and the rotary shaft 50 are connected to each other via a power transmission mechanism 120 so that power can be transmitted. Therefore, when the rotor member 64 rotates, the rotating shaft 50 rotates by a rotation angle proportional to the rotation angle of the rotor member 64.

The rotating shaft 50 rotates the driver 30. In the example illustrated in FIG. 2, the second end portion 52 (that is, the shaft-side engaging member) of the rotating shaft 50 and the upper end portion 34 (that is, the driver-side engaging member) of the driver 30 cannot rotate relative to each other. , Mechanically connected to. The second end 52 of the rotary shaft 50 and the upper end 34 of the driver 30 are movable relative to each other along the first axis Z. Therefore, the rotary shaft 50 can move the driver 30 up and down without changing the vertical position of the rotary shaft 50 itself.

The permanent magnet member 70 described above is disposed on the first end portion 54 of the rotating shaft 50. In the example shown in FIG. 2, the vertical position of the rotating shaft 50 does not change due to the rotating operation of the rotating shaft 50. Therefore, the permanent magnet member 70 also does not change its vertical position due to the rotating operation of the rotary shaft 50. Therefore, during the operation of the motor-operated valve B, the distance between the permanent magnet member 70 and the angle sensor 80 is maintained constant.

That is, in the second embodiment, since the rotary shaft 50 and the driver 30 are separate bodies, and the rotary shaft 50 and the driver 30 are movable relative to each other along the first axis Z, the rotation is prevented. It is possible to keep the distance between the permanent magnet member 70 arranged on the shaft 50 and the angle sensor 80 constant. As a result, the accuracy of detection of the rotation angle of the permanent magnet 72 by the angle sensor 80 is improved. When the rotary shaft 50 and the permanent magnet 72 move up and down as the driver 30 moves up and down, the accuracy of detection of the rotation angle of the permanent magnet 72 by the angle sensor 80 may decrease. On the other hand, the second embodiment is epoch-making in that the rotating shaft 50 and the permanent magnet 72 are prevented from moving up and down even if the driver 30 moves up and down.

In the example shown in FIG. 2, it can be said that the rotating shaft 50 itself functions as a permanent magnet positioning member that maintains a constant distance between the permanent magnet 72 and the angle sensor 80. In the second embodiment, the connection between the rotating shaft 50 and the permanent magnet member 70 may be directly or indirectly connected so that the rotating shaft 50 and the permanent magnet member 70 cannot move relative to each other. However, any connection may be used. However, it is preferable that the rotary shaft 50 and the permanent magnet member 70 are directly fixed to each other from the viewpoint of more reliably preventing relative movement.

In the example shown in FIG. 2, a partition member 130 that partitions the interior of the can into an upper space and a lower space is arranged inside the can 100. The permanent magnet member 70 is disposed in the upper space formed by the partition member 130, that is, the space between the partition member 130 and the end wall 102 (upper wall) of the can 100. Therefore, even if the permanent magnet member 70 is chipped or the like, magnetic particles and the like do not enter the lower space. The partition member 130 may be a bearing member that rotatably supports the rotary shaft 50 with respect to the can 100. When the partition member 130 is a bearing member, the partition member 130 has a function as a partition that partitions between an upper space in which the permanent magnet member 70 is arranged and a lower space in which the rotor member 64 and the like are arranged, It will have both functions as a bearing. The partition member 130 has, for example, a disc shape.

The material of the partition member 130 will be described. The partition member 130 of the present embodiment is made of resin (for example, PPS: polyphenylene sulfide resin), for example. Alternatively, the partition member 130 may be formed of a soft magnetic material. Examples of soft magnetic materials include iron, silicon steel, and magnetic resins. By constructing a member that partitions the inside of the can into an upper space and a lower space with a soft magnetic material, it is possible to prevent the magnetism of the permanent magnet member 70 from interfering with other magnetism (for example, the magnetism of the rotor member 64). .. Specifically, the permanent magnet member 70 is magnetized to have two poles in the circumferential direction, and the rotor member 64 is magnetized so that magnetic poles having four or more poles (for example, eight poles) are alternately replaced in the circumferential direction. .. Therefore, by preventing the magnetism of the permanent magnet member 70 and the magnetism of the rotor member 64 from interfering with each other, it is possible to prevent the deviation of the angle measured by the angle sensor 80 and the slight torque fluctuation of the rotation of the rotor member 64. Of course, the partition member 130 of the third embodiment described later may be formed of a soft magnetic material.

(Power transmission mechanism)
An example of a mechanism for transmitting power from the power source 60 to the valve body 10 will be described in detail with reference to FIG. FIG. 3 is a schematic enlarged cross-sectional view of a part of the motor-operated valve B according to the second embodiment.

In the example shown in FIG. 3, the stator member 62 forming a part of the power source 60 is fixed to the side wall 104 of the can 100. The stator member 62 includes a bobbin 622 and a coil 620 wound around the bobbin.

In the example shown in FIG. 3, the rotor member 64 forming a part of the power source 60 is arranged inside the side wall 104 of the can 100 so as to be rotatable with respect to the can 100. The rotor member 64 is made of a magnetic material. The rotor member 64 is connected (fixed) to the power transmission mechanism 120, for example, the sun gear member 121.

The sun gear member 121 includes a connecting portion 1211 connected to the rotor member 64 and a sun gear 1212. The connecting portion 1211 extends along the radial direction (direction perpendicular to the first axis Z), and the sun gear 1212 extends along the first axis Z. The rotary shaft 50 is arranged in the shaft hole of the sun gear 1212 so as to be rotatable relative to the inner wall of the sun gear.

The outer teeth of the sun gear 1212 mesh with the plurality of planet gears 122. Each planet gear 122 is rotatably supported by a shaft 124 supported by a carrier 123. The outer teeth of each planetary gear 122 mesh with an annular ring gear 125 (fixed gear with inner teeth).

The ring gear 125 is a member that cannot rotate relative to the can 100. In the example shown in FIG. 3, the ring gear 125 is supported by a holder 150 described later via a cylindrical support member 126.

The planetary gear 122 also meshes with an annular second ring gear 127 (inner tooth movable gear). In the example shown in FIG. 3, the second ring gear 127 functions as an output gear fixed to the rotary shaft 50. Alternatively, an output gear different from the second ring gear 127 may be fixed to the rotary shaft 50, and the power from the second ring gear 127 may be transmitted to the rotary shaft 50 via the output gear. The rotation shaft 50 may be fixed to the output gear by pressing the rotation shaft 50 into the output gear.

The above-described gear configuration (sun gear, planet gear, fixed internal gear, and movable internal gear) constitutes a so-called mysterious planetary gear mechanism. In the speed reducer using the mysterious planetary gear mechanism, the number of teeth of the second ring gear 127 is set to be slightly different from the number of teeth of the ring gear 125 to reduce the rotation speed of the sun gear 1212 at a large reduction ratio. Can be transmitted to the second ring gear 127.

In the example shown in FIG. 3, a mysterious planetary gear mechanism is used as the power transmission mechanism 120. However, in the embodiment, it is possible to employ any power transmission mechanism as the power transmission mechanism between the rotor member 64 and the rotary shaft 50. As the power transmission mechanism 120, a planetary gear mechanism other than the mysterious planetary gear mechanism may be adopted.

As shown in FIG. 3, the rotating shaft 50 includes a first end portion 54 and a second end portion 52. In the example illustrated in FIG. 3, the rotary shaft 50 includes a rotary shaft main body including the first end portion 54 and a shaft side engaging member including the second end portion 52. The rotary shaft main body and the shaft side engaging member are fixed to each other by, for example, welding. The shaft-side engaging member engages with the driver-side engaging member formed by the upper end portion 34 of the driver 30 such that the shaft-side engaging member is relatively non-rotatable and relatively movable along the first axis Z direction.

A male screw 31 is provided on the outer peripheral surface of the driver 30. The male screw 31 is screwed into a female screw 41 provided on a guide member 40 that guides the driver. Therefore, when the rotary shaft 50 and the driver 30 rotate about the first axis Z, the driver 30 moves up and down while being guided by the guide member 40. On the other hand, the rotary shaft 50 is rotatably supported by the sun gear 1212 or a shaft receiving member such as the guide member 40, and is immovable in the first axis Z direction.

In the example illustrated in FIG. 3, the guide member 40 that guides the driver 30 is supported by the holder 150 described below.

The lower end 32 of the driver 30 is rotatably connected to the upper end 12 of the valve body 10 via a ball 160 and the like. In the example illustrated in FIG. 3, when the driver 30 moves downward while rotating about the first axis Z, the valve body 10 moves downward without rotating about the first axis Z. When the driver 30 moves upward while rotating around the first axis Z, the valve body 10 moves upward without rotating around the first axis Z.

The downward movement of the valve body 10 is performed by pushing the valve body 10 by the driver 30. The upward movement of the valve body 10 is performed by pushing the valve body 10 upward by a spring member 170 such as a coil spring while the driver 30 is moving upward. That is, in the example shown in FIG. 3, the valve element 10 is constantly urged upward by the spring member 170 arranged between the spring receiving member 172 and the valve element 10. Alternatively or additionally, the valve body 10 and the driver 30 may be connected by a rotary joint such as a ball joint so as to be relatively immovable in the direction along the first axis Z. In this case, the spring member 170 may be omitted.

With the above configuration, it is possible to drive the valve body 10 using the power from the power source 60. The amount of movement of the valve body 10 in the direction along the first axis Z is proportional to the amount of rotation of the rotary shaft 50 and the permanent magnet 72. Therefore, in the second embodiment, the position of the valve body 10 in the direction along the first axis Z is accurately obtained by measuring the rotation angle of the permanent magnet 72 around the first axis Z. Is possible. The motor-operated valve B may include an arithmetic device that converts the angle data output by the angle sensor 80 into position data of the valve body 10 in the direction along the first axis Z, that is, valve opening data. ..

In the second embodiment, the rotary shaft 50 and the permanent magnet 72 do not move up and down with respect to the angle sensor 80. In other words, when the electric valve B is operated, the distance between the permanent magnet 72 and the angle sensor 80 is kept constant. Therefore, in the second embodiment, it is possible to accurately calculate the rotation angle of the permanent magnet 72 and the position of the valve body 10 in the direction along the first axis Z by using the angle sensor 80.

In the example shown in FIG. 3, the holder 150 is arranged in the recess of the lower base member 2. Further, a first seal member 152 such as an O-ring is arranged between the holder 150 and the lower base member 2. Further, the holder 150 defines an internal space in which the upper end 12 of the valve body 10 can move. Therefore, the holder 150 has a function of housing the upper end portion 12 of the valve body 10 in addition to a sealing function of preventing liquid from entering the space in which the stator member 62 and the like are arranged.

Further, the holder 150 may have a function of supporting at least one of the cylindrical support member 126 and the guide member 40 as described above.

Further, in the example shown in FIG. 3, the holder 150 is arranged so as to contact the side wall portion of the housing member 4. A second seal member 154 such as an O-ring is arranged between the holder 150 and the side wall of the housing member 4. Therefore, the holder 150 can further prevent the liquid from entering the space in which the stator member 62 and the like are arranged.

The components of the motor-operated valve B according to the second embodiment may be adopted in the motor-operated valve A according to the first embodiment shown in FIG. 1.

(Third Embodiment)
A motor-operated valve C according to the third embodiment will be described with reference to FIGS. 5 to 8. FIG. 5 is a schematic enlarged cross-sectional view of a part of the motor-operated valve B according to the third embodiment. FIG. 6 is a sectional view taken along the line AA in FIG. FIG. 7: is the figure which expanded a part of FIG. 5 further. FIG. 8 is a sectional view taken along the line BB in FIG.

In the motor-operated valve C according to the third embodiment, the structure of the rotary shaft 50a and the support mechanism of the permanent magnet member 70 are the same as the structure of the rotary shaft according to the first and second embodiments, and the support mechanism of the permanent magnet member. different. Therefore, in the third embodiment, the structure of the rotary shaft 50a and the support mechanism of the permanent magnet member 70 will be mainly described, and repeated description of other structures will be omitted.

In the second embodiment, the rotating shaft 50 is a member that does not move up and down with respect to the can 100, whereas in the third embodiment, the rotating shaft 50a is with respect to the can 100 and the permanent magnet member 70. , A member that moves up and down. Note that, in the third embodiment, the permanent magnet member 70 is a member that does not move vertically with respect to the can 100, as in the second embodiment.

An example of a mechanism for making the rotating shaft 50a movable relative to the permanent magnet member 70 will be described with reference to FIG. As shown in FIG. 6, the permanent magnet member 70 has a second engaging portion 73 that engages with the first engaging portion 53 of the rotary shaft 50a. The first engaging portion 53 and the second engaging portion 73 engage with each other (contact each other) when the rotary shaft 50a rotates about the first axis Z. On the other hand, the first engaging portion 53 and the second engaging portion 73 do not engage with each other in the direction along the first axis Z. Therefore, the rotary shaft 50 a cannot rotate relative to the permanent magnet member 70 and can move up and down with respect to the permanent magnet member 70.

As shown in FIG. 6, the permanent magnet member 70 may include a hole portion 76 that is a through hole or a non-through hole. The cross-sectional shape of the hole portion 76 perpendicular to the first axis Z is a non-circular shape (for example, a D shape). The cross-sectional shape of the portion of the rotary shaft 50a that enters the hole 76 is a shape complementary to the wall surface defining the inner surface of the hole 76, and is a non-circular shape (for example, D-shape).

In the example shown in FIG. 6, the permanent magnet member 70 includes a permanent magnet 72 and a collar member 74 fixed to the permanent magnet 72. The collar member 74 is arranged inside the permanent magnet 72 (on the radially inner side). The collar member 74 is provided with the above-mentioned second engaging portion 73.

In the example shown in FIG. 6, it is not the permanent magnet 72 but the collar member 74 that contacts the rotary shaft 50a. Therefore, the permanent magnet 72 does not wear due to the contact between the rotary shaft 50a and the permanent magnet 72. The material of the collar member 74 is, for example, SUS304.

Next, the permanent magnet positioning member 180 that maintains the distance between the permanent magnet 72 and the angle sensor 80 constant will be described with reference to FIG. 7. The permanent magnet positioning member 180 is arranged inside the can 100, which is a case. In the example shown in FIG. 7, the permanent magnet positioning member 180 includes a ball 184 that functions as a bearing member and a leaf spring 182. In other words, the permanent magnet positioning member 180 is the ball 184 and the leaf spring 182 arranged so as to sandwich the permanent magnet member 70.

The ball 184 is arranged between the end wall 102 of the can 100 and the permanent magnet member 70. The ball 184 functions as a bearing for the permanent magnet member 70 and also as a positioning member that defines the vertical position of the permanent magnet member 70.

In the example shown in FIG. 7, the leaf spring 182 is arranged between the partition member 130 (bearing member) and the permanent magnet member 70. The leaf spring 182 biases the permanent magnet member 70 toward the end wall 102 of the can 100. In order to absorb the assembly error of the motor-operated valve C, the partition member 130 (bearing member) may be arranged so that it can move up and down by a minute distance with respect to the can 100. Even when the partition member can move up and down with respect to the can 100, the leaf spring 182 urges the permanent magnet member 70 against the end wall 102, so that the vertical position of the permanent magnet member 70 is preferably maintained. To be done.

An arbitrary bearing member different from the ball 184 may be arranged between the end wall 102 of the can 100 and the permanent magnet member 70. Further, instead of the leaf spring 182, any bearing member may be arranged between the partition member 130 and the permanent magnet member 70. Even in this case, an arbitrary bearing member keeps the distance between the permanent magnet 72 and the angle sensor 80 constant.

In the example shown in FIGS. 5 to 7, the rotary shaft 50a itself can move up and down. Therefore, the rotary shaft 50a itself can be used as the driver 30. That is, the rotating shaft 50a has both the function of rotating the permanent magnet member 70 and the function of a driver for moving the valve body 10 toward the valve seat 20.

In the first and second embodiments, the example in which the rotary shaft 50 is fixed to the output gear has been described. On the other hand, in the third embodiment, the output gear 129 and the rotary shaft 50a are not fixed to each other. Instead, the output gear 129 and the rotary shaft 50a are engaged with each other so as not to rotate relative to each other around the first axis Z.

With reference to FIG. 8, an example of an engagement mechanism that engages the output gear 129 and the rotary shaft 50a in a non-rotatable manner will be described. FIG. 8 is a sectional view taken along the line BB in FIG.

As shown in FIG. 8, the output gear 129 has a fourth engaging portion 1290 that engages with the third engaging portion 55 of the rotary shaft 50a. The third engagement portion 55 and the fourth engagement portion 1290 engage with each other (contact each other) when the rotary shaft 50a rotates about the first axis Z. On the other hand, the third engagement portion 55 and the fourth engagement portion 1290 do not engage with each other in the direction along the first axis Z. Therefore, the rotary shaft 50 a cannot rotate relative to the output gear 129 and can move up and down with respect to the output gear 129.

As shown in FIG. 8, the output gear 129 includes a rotating shaft receiving portion 1291 such as a hole or a slit. The sectional shape of the rotating shaft receiving portion 1291 is a non-circular shape (for example, a rectangular shape). The cross-sectional shape of the portion of the rotary shaft 50a that enters the rotary shaft receiving portion 1291 is a shape complementary to the wall surface defining the inner surface of the rotary shaft receiving portion 1291 and is a non-circular shape (for example, a rectangular shape). is there.

As shown in FIG. 7, the output gear 129 is supported by a support member such as the guide member 40 so as to be rotatable about the first axis Z.

In the third embodiment, the output gear 129 is rotated by the power from the power source 60. The power transmission mechanism from the power source 60 to the output gear 129 may be the power transmission mechanism such as the planetary gear mechanism described in the second embodiment.

When the output gear 129 rotates, the rotary shaft 50a rotates. In the third embodiment, the rotary shaft 50a and the driver 30 are one member integrally formed, or are members integrally fixed and fixed to each other. A male screw 31 is provided on the outer peripheral surface of the driver 30, and the male screw 31 is screwed into a female screw 41 provided on a guide member 40 that guides the driver.

Therefore, when the rotary shaft 50a rotates, the rotary shaft 50a (the rotary shaft 50a including the driver) moves along the first axis Z. The rotary shaft 50a and the valve body 10 are mechanically connected. Therefore, when the rotary shaft 50a moves along the first axis Z, the valve body 10 also moves along the first axis Z.

With the above configuration, it is possible to drive the valve body 10 using the power from the power source 60. The amount of movement of the valve body 10 in the direction along the first axis Z is proportional to the amount of rotation of the rotary shaft 50a and the permanent magnet 72. Therefore, in the third embodiment, the position of the valve body 10 in the direction along the first axis Z is accurately obtained by measuring the rotation angle of the permanent magnet 72 around the first axis Z. Is possible. The motor-operated valve C may include an arithmetic device that converts the angle data output by the angle sensor 80 into position data in the direction along the first axis Z of the valve body 10, that is, valve opening data. ..

In the third embodiment, it is not necessary to fix the permanent magnet member 70 to the rotating shaft 50a. Further, it is not necessary to fix the rotary shaft 50a to the output gear. Therefore, the electric valve C can be efficiently assembled.

(Example of angle sensor)
An example of the angle sensor 80 in each embodiment will be described with reference to FIGS. 9 to 12. 9 to 12 are diagrams schematically showing the positional relationship between the permanent magnet 72 and the angle sensor 80. A bottom view is shown on the upper side, and a partially cutaway perspective view is shown on the lower side. There is.

As shown in FIG. 9, the permanent magnet 72 has an N pole and an S pole in a top view. In the example shown in FIG. 9, the number of north poles of the permanent magnet 72 is one and the number of south poles of the permanent magnet 72 is one in a top view. Alternatively, the number of N poles of the permanent magnets and the number of S poles of the permanent magnets may be two or more, respectively, in a top view. In the example shown in FIG. 9, the permanent magnet 72 has a boundary surface 78 between the N pole and the S pole, and the boundary surface 78 has a first axis Z that coincides with the central axis of the rotating shaft (50; 50a). As described above, the plane is perpendicular to the first axis Z. The north pole is arranged on one side of the boundary surface 78, and the south pole is arranged on the other side of the boundary surface 78. The permanent magnet 72 is, for example, a disk-shaped magnet. Further, the permanent magnet 72 may be a plastic magnet obtained by mixing and molding magnetic powder and a resin binder.

The angle sensor 80 is arranged above the permanent magnet 72. In the example shown in FIG. 9, the angle sensor 80 is located on the extension line of the rotating shaft (50; 50a), that is, on the first axis Z. The angle sensor 80 includes at least one magnetic detection element 82 (for example, a Hall element, a magnetic resistance element, etc.), and more preferably includes two or more magnetic detection elements or three or more magnetic detection elements.

In the example illustrated in FIG. 9, the angle sensor 80 includes four magnetic detection elements (82a to 82d). The magnetic detection elements (82a to 82d) may be elements that detect a component of the magnetic flux in the direction along the first axis Z. In FIG. 9, the magnetic detection element 82a and the magnetic detection element 82d detect the magnetic flux component in the +Z direction, and the magnetic detection element 82b and the magnetic detection element 82c detect the magnetic flux component in the −Z direction. When the magnitude of the magnetic flux detected by the magnetic detection element 82a (or the magnetic detection element 82b) and the magnitude of the magnetic flux detected by the magnetic detection element 82d (or the magnetic detection element 82c) are equal to each other, the boundary surface 78 has the X-axis. Vertical to. At this time, the angle sensor 80 determines that the rotation angle of the permanent magnet 72 is, for example, 0 degrees.

As shown in FIG. 10, it is assumed that the permanent magnet 72 rotates in the R direction. In FIG. 10, the magnetic detection element 82a and the magnetic detection element 82d detect the magnetic flux component in the +Z direction, and the magnetic detection element 82b and the magnetic detection element 82c detect the magnetic flux component in the −Z direction. As the state shown in FIG. 9 shifts to the state shown in FIG. 10, the magnitude of the magnetic flux detected by the magnetic detection element 82b and the magnetic detection element 82d increases and is detected by the magnetic detection element 82a and the magnetic detection element 82c. The magnitude of the applied magnetic flux is reduced. For example, the ratio between the magnitude of the magnetic flux detected by the magnetic detection element 82a and the magnitude of the magnetic flux detected by the magnetic detection element 82d, and the magnitude of the magnetic flux detected by the magnetic detection element 82a and the magnetic detection element 82b. The angle sensor 80 can obtain the inclination of the magnetic force line with respect to the X axis, that is, the rotation angle of the permanent magnet 72, based on the ratio with the magnitude of the detected magnetic flux.

As shown in FIG. 11, it is assumed that the permanent magnet 72 further rotates in the R direction. In FIG. 11, the magnetic detection element 82d detects a magnetic flux component in the +Z direction, and the magnetic detection element 82b detects a magnetic flux component in the −Z direction. As the state shown in FIG. 10 shifts to the state shown in FIG. 11, the magnitude of the magnetic flux detected by the magnetic detection element 82b and the magnetic detection element 82d decreases. Further, the magnitude of the magnetic flux detected by the magnetic detection element 82a and the magnetic detection element 82c decreases. For example, the ratio between the magnitude of the magnetic flux detected by the magnetic detection element 82a and the magnitude of the magnetic flux detected by the magnetic detection element 82d, and the magnitude of the magnetic flux detected by the magnetic detection element 82a and the magnetic detection element 82b. The angle sensor 80 can obtain the inclination of the magnetic force line with respect to the X axis, that is, the rotation angle of the permanent magnet 72, based on the ratio with the magnitude of the detected magnetic flux.

As shown in FIG. 12, it is assumed that the permanent magnet 72 further rotates in the R direction. In FIG. 12, the magnetic detection element 82c and the magnetic detection element 82d detect the magnetic flux component in the +Z direction, and the magnetic detection element 82a and the magnetic detection element 82b detect the magnetic flux component in the −Z direction. As the state shown in FIG. 11 shifts to the state shown in FIG. 12, the magnitude of the magnetic flux detected by the magnetic detection element 82a and the magnetic detection element 82c increases and detected by the magnetic detection element 82b and the magnetic detection element 82d. The magnitude of the applied magnetic flux is reduced. For example, the ratio between the magnitude of the magnetic flux detected by the magnetic detection element 82a and the magnitude of the magnetic flux detected by the magnetic detection element 82d, and the magnitude of the magnetic flux detected by the magnetic detection element 82a and the magnetic detection element 82b. The angle sensor 80 can obtain the inclination of the magnetic force line with respect to the X axis, that is, the rotation angle of the permanent magnet 72, based on the ratio with the magnitude of the detected magnetic flux.

As understood from FIGS. 9 to 12, the angle sensor 80 can detect the inclination of the permanent magnet 72 with respect to the X axis, that is, the absolute rotation angle of the permanent magnet 72. That is, even when the permanent magnet 72 is not rotationally moved, the angle sensor 80 can calculate the inclination (that is, the rotation angle) of the permanent magnet 72 with respect to the X axis. The calculation of the rotation angle is performed based on, for example, the direction of the magnetic flux passing through the at least three magnetic detection elements 82 and the magnitude of the magnetic flux passing through the at least three magnetic detection elements 82.

In the examples shown in FIGS. 9 to 12, the angle sensor 80 can detect the absolute rotation angle of the permanent magnet 72. Therefore, even if the motor valve is powered off and the rotation angle information of the permanent magnet 72 is lost, when the power is turned on again, the angle sensor 80 immediately detects the permanent magnet 72. It is possible to obtain (output) the rotation angle of.

In the example illustrated in FIGS. 9 to 12, the example in which each magnetic detection element detects the magnetic flux component in the direction along the first axis (Z axis) has been described. Alternatively, each magnetic detection element may detect the magnetic flux component in the direction along the X axis and/or the magnetic flux component in the direction along the Y axis perpendicular to both the X axis and the Z axis.

Each of the permanent magnet 72 and the angle sensor 80 described with reference to FIGS. 9 to 12 can be adopted in the motor-operated valve in the first and second embodiments or the motor-operated valve in the third embodiment.

(Computing device that determines whether or not there is a malfunction in the motor-operated valve)
With reference to FIG. 13, a calculation device 200 for determining whether or not there is an operation abnormality of the motor-operated valve will be described. FIG. 13 is a functional block diagram schematically showing the function of the arithmetic device 200 for determining the presence/absence of operation abnormality of the motor-operated valve.

The motor-operated valve includes the arithmetic unit 200. The arithmetic device 200 includes, for example, a hardware processor and a storage device 202, and is connected to the output device 220 so that information can be transmitted. It can be said that the motor-operated valve is a motor-operated valve system including the arithmetic device 200 (or the arithmetic device and the output device 220).

The motor-operated valves B and C (motor-operated valve system) include the stator member 62 including the coil 620 and the rotor member 64, as described in the second embodiment or the third embodiment. The rotation angle of the rotor member 64 and the position of the valve body 10 (height from the valve seat 20) proportional to the rotation angle of the rotor member 64 are proportional to the number of input pulses input to the coil 620. Therefore, by monitoring the number of input pulses input to the coil 620, the position of the valve body 10 (height from the valve seat 20) can be calculated.

On the other hand, the position of the valve body 10 (height from the valve seat 20) is also proportional to the rotation angle of the permanent magnet 72. Therefore, the position of the valve body 10 (height from the valve seat 20) can be calculated by monitoring the rotation angle of the permanent magnet 72. In principle, the position of the valve body 10 calculated from the number of input pulses to the coil 620 and the position of the valve body 10 calculated from the rotation angle of the permanent magnet 72 match. Therefore, when the position of the valve body 10 calculated from the number of input pulses to the coil 620 is different from the position of the valve body 10 calculated from the rotation angle of the permanent magnet 72, the arithmetic device 200 operates the electrically operated valves B and C. It is determined that there is something wrong with the (motorized valve system). That is, the motor-operated valves B and C (motor-operated valve system) have a self-diagnosis function of detecting the presence/absence of abnormality of the motor-operated valves.

The position of the valve body 10 and the rotation angle of the rotary shaft 50 (50a) are in a proportional relationship, the position of the valve body 10 and the rotation angle of the permanent magnet 72 are in a proportional relationship, and the position of the valve body 10 and the output It is proportional to the rotation angle of the gear. Therefore, in the present specification, calculating the position of the valve body 10 is equivalent to calculating the rotation angle of the rotary shaft 50, and calculating the position of the valve body 10 and the permanent magnet 72 Calculating the rotation angle is equivalent to calculating the position of the valve body 10 and calculating the rotation angle of the output gear.

The arithmetic device 200 will be described more specifically with reference to FIG. 13. The arithmetic device 200 receives the rotation angle data of the permanent magnet from the angle sensor 80 via a wire or wirelessly. Further, the arithmetic device 200 receives data of the number of input pulses to the coil 620 from the control board 90 or the like described above via a wire or wirelessly. The arithmetic device 200 stores the received rotation angle data and input pulse number data in the storage device 202.

The storage device 202 of the arithmetic device 200 stores a first valve body position calculation program for calculating the position α of the valve body 10 from the rotation angle data of the permanent magnet. In the present specification, the position α of the valve body 10 includes a valve such as the rotation angle of the rotary shaft 50, the rotation angle of the permanent magnet, or the rotation angle of the output gear in addition to the position itself of the valve body 10. A physical quantity proportional to the position of the body 10 is included. The arithmetic unit 200 calculates the position α of the valve body 10 from the rotation angle data of the permanent magnet by executing the first valve body position calculation program.

Further, the storage device 202 of the arithmetic device 200 stores a second valve body position calculation program for calculating the position β of the valve body 10 from the data of the number of input pulses. In the present specification, the position β of the valve body 10 includes a valve such as the rotation angle of the rotary shaft 50, the rotation angle of the permanent magnet, or the rotation angle of the output gear in addition to the position itself of the valve body 10. A physical quantity proportional to the position of the body 10 is included. The arithmetic device 200 calculates the position β of the valve body 10 from the data of the number of input pulses to the coil 620 by executing the second valve body position calculation program.

Further, the storage device 202 of the arithmetic device 200 compares the valve body position α with the valve body position β, and determines whether or not there is an operation abnormality of the electric valve (electric valve system) based on the comparison result. A judgment program is stored. The arithmetic device 200 determines whether or not there is an operation abnormality of the motor-operated valve (motor-operated valve system) by executing the determination program. For example, the arithmetic device 200 determines whether or not the difference between the valve body position α and the valve body position β is equal to or greater than a preset threshold value by executing the determination program. Then, the arithmetic device 200 executes the determination program to operate the electrically operated valve (electrically operated valve system) when the difference between the valve body position α and the valve body position β is equal to or greater than a preset threshold value. It may be determined that there is an abnormality. If the arithmetic unit 200 determines that there is an operation abnormality of the motor-operated valve (motor-operated valve system) by executing the determination program, it sends a signal indicating the operation abnormality to the output device 220 such as a display or an alarm device. Good. Alternatively or additionally, when the arithmetic device 200 determines that there is an abnormal operation of the motor-operated valve (motor valve system) by executing the determination program, the calculation result is stored in the storage device 202. You may. In this case, the operation abnormality of the motor-operated valve (motor-operated valve system) is stored in the storage device 202 as log data.

When the motor-operated valve (motor-operated valve system) includes the arithmetic device 200 described above, the position of the valve body 10 is calculated using both the number of input pulses to the coil 620 and the rotation angle of the permanent magnet measured by the angle sensor. It is possible to double check. As a result, the reliability of the motor-operated valve (motor-operated valve system) is dramatically improved.

In the arithmetic device 200 described above, instead of using programs such as the first valve body position calculation program, the second valve body position calculation program, and the determination program, the first valve body position calculation, the second valve body The position calculation and the presence/absence of the operation abnormality of the motor-operated valve (motor-operated valve system) may be performed by an electronic circuit by hardware. Further, the electronic circuit or the hardware processor of the arithmetic unit 200 may be mounted on the control board 90.

The configuration of the arithmetic device 200 and the like described with reference to FIG. 13 may be adopted in the motor-operated valve B in the second embodiment or the motor-operated valve C in the third embodiment. 13 is used when at least a stator member including a coil and a rotor member that is power-transmittablely coupled to a rotating shaft are added to the motor-operated valve A according to the first embodiment shown in FIG. The configuration of the arithmetic device 200 and the like described above may be adopted in the motor-operated valve A in the embodiment shown in FIG.

The present invention is not limited to the above embodiment. Within the scope of the present invention, it is possible to freely combine the above-described embodiments, modify any constituent element of each embodiment, or omit any constituent element in each embodiment.

A, B, C: Motorized valve 2: Lower base member 4: Housing member 4a: Cylindrical member 4b: Cover member 10: Valve body 12: Upper end portion 20: Valve seat 30: Driver 31: Male screw 32: Lower end portion 34 : Upper end portion 40: Guide member 41: Female screw 50: Rotating shaft 50a: Rotating shaft 52: Second end portion 53: First engaging portion 54: First end portion 55: Third engaging portion 60: Power source 62: Stator member 64: Rotor member 70: Permanent magnet member 72: Permanent magnet 73: Second engaging portion 74: Collar member 76: Hole portion 78: Boundary surface 80: Angle sensor 82: Magnetic detection elements 82a to 82d: Magnetic detection element 90: control board 100: can 102: end wall 104: side wall 112: first flow path 113: valve chamber 114: second flow path 120: power transmission mechanism 121: sun gear member 122: planetary gear 123: carrier 124: shaft 125: Ring gear 126: Support member 127: Second ring gear 129: Output gear 130: Partition member 150: Holder 152: First sealing member 154: Second sealing member 160: Ball 170: Spring member 172: Spring receiving member 180: Permanent Magnet positioning member 182: Leaf spring 184: Ball 200: Computing device 202: Storage device 220: Output device 620: Coil 622: Bobbin 630: Electric wire 1211: Connecting part 1212: Sun gear 1290: Fourth engaging part 1291: Rotating shaft Receptor

Claims (8)

Valve body,
A driver that moves the valve element along a first axis,
A rotating shaft for rotating the driver about the first axis;
A permanent magnet member arranged on the rotating shaft and rotating together with the rotating shaft;
An angle sensor that detects a rotation angle of a permanent magnet included in the permanent magnet member,
A case containing the permanent magnet member ,
The angle sensor is disposed above the permanent magnet ,
An end wall of the case is disposed between the angle sensor and the permanent magnet member,
A motor-operated valve in which a permanent magnet positioning member that maintains a constant distance between the permanent magnet and the angle sensor is disposed inside the case . Valve body,
A driver that moves the valve element along a first axis,
A rotating shaft for rotating the driver about the first axis;
A permanent magnet member arranged on the rotating shaft and rotating together with the rotating shaft;
An angle sensor that detects a rotation angle of a permanent magnet included in the permanent magnet member,
A case accommodating the permanent magnet member
Equipped with,
The angle sensor is disposed above the permanent magnet,
An end wall of the case is disposed between the angle sensor and the permanent magnet member,
Further comprising a partition member for partitioning the space in the case into an upper space and a lower space,
The motor-operated valve in which the permanent magnet member is arranged in the upper space . The motor operated valve according to claim 2 , wherein the partition member is made of a soft magnetic material . Valve body,
A driver that moves the valve element along a first axis,
A rotating shaft for rotating the driver about the first axis;
A permanent magnet member arranged on the rotating shaft and rotating together with the rotating shaft;
An angle sensor for detecting a rotation angle of a permanent magnet included in the permanent magnet member,
Equipped with,
The angle sensor is disposed above the permanent magnet,
The rotating shaft is relatively movable with respect to the permanent magnet member in a direction along the first axis,
The said permanent magnet member is a motor operated valve provided with the 2nd engaging part which engages with the 1st engaging part of the said rotating shaft so that the said permanent magnet may rotate with the said rotating shaft . The motor-operated valve according to any one of claims 1 to 4, wherein the angle sensor is supported by a control board that controls a rotating operation of the rotating shaft . The driver and the rotating shaft are separate bodies,
The motor-operated valve according to any one of claims 1 to 5, wherein the driver and the rotary shaft are movable relative to each other along the first axis . The motor-operated valve according to any one of claims 1 to 6, wherein the angle sensor includes a plurality of magnetic detection elements that detect a component of a magnetic flux in a direction along the first axis . A stator member including a coil,
A rotor member connected to the rotating shaft so as to be capable of transmitting power,
With a computing device that determines whether or not there is a malfunction in the motor operated valve
Further equipped with,
The computing device includes: the rotational angle measured by said angle sensor, on the basis of the input number of pulses to the coil, in any one of claims 1 to 7 determines the presence or absence of abnormal operation of the electric valve Motorized valve described.

Images